 | Adrien Marie Legendre - 1822 - 394 σελίδες
...polygon, and the lines themselves taken together form the contour or perimeter of the polygon. XIV. The polygon of three sides, the simplest of all, is called a triangle ; that of four sides, a quadilateral ; that of five, a pentagon ; that of six, a hexagon ; and so on. XVI. A right-angled triangle... | |
 | Adrien Marie Legendre - 1828 - 346 σελίδες
...13. A plane figure is a plane terminated on all sides by lines. If the lines are straight, the spare they enclose is called a rectilineal figure, or polygon,...that of five, a pentagon ; that of six, a hexagon ; and so on. 15. An equilateral triangle is one which has its three sides equal ; an isosceles triangle,... | |
 | Adrien Marie Legendre - 1830 - 344 σελίδες
...either way, both of them __ be produced. 13. A plane figure is a plain terminated on all sides by lines. If the lines are straight, the space they enclose...that of five, a pentagon ; that of six, a hexagon ; and so on. 15. An equilateral triangle is one which has its three sides equal ; an isosceles triangle,... | |
 | John Playfair - 1835 - 336 σελίδες
...polygon, and the lines themselves taken together form the contour, or perimeter of the polygon. 17. The polygon of three sides, the simplest of all, is...that of five, a pentagon ; that of six, a hexagon ; and so on. 18. Of three sided figures, an equilateral triangle is that which has three equal sides.... | |
 | Adrien Marie Legendre - 1836 - 394 σελίδες
...angle BAC, less than aD\ right angle, is an acute angle ; and \ every angle DEF, greater than aright \ angle, is an obtuse angle. 12.- Two lines are said...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. B 15. An equilateral triangle is one which has its three sides equal... | |
 | Adrien Marie Legendre - 1837 - 376 σελίδες
...right angle ; and the line AB is said to be perpendicular to CD. ; D 11. Every angle BAC, less than aD\ right angle, is an acute angle ; and every angle DEF,...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. 15. An equilateral triangle is one which has its three sides equal... | |
 | Adrien Marie Legendre - 1838 - 382 σελίδες
...situated in the same plane, they cannot meet, how far soever, either way, both of them ~ be produced. J3. A plane figure is a plane terminated on all sides...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. BOOK I. 11 15. An equilateral triangle is one which has its three... | |
 | Charles Davies - 1839 - 376 σελίδες
...10. When a straight line AB meets another straight line CD, so as to make the adjacent angles BAC, BAD, equal to each other, each of these angles is...triangle; that of four sides, a quadrilateral; that of live, & pentagon; that of six, a hexagon ; that of seven, a heptagon; that of eight, an octagon; that... | |
 | Adrien Marie Legendre - 1839 - 372 σελίδες
...polygon, and the lines themselves, taken together, form the contour, or perimeter of the polygon, t 14. The polygon of three sides, the simplest of all,...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. 15. An equilateral triangle is one which has its three sides equal... | |
 | Charles Davies - 1835 - 388 σελίδες
...10. When a straight line AB meets another straight line CD, so as to make the adjacent angles BAC, BAD, equal to each other, each of these angles is...An equilateral triangle is one which has its three sides equal ; an isosceles triangle, one which has two of its sides equal; a scalene triangle, one... | |
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Two lines are said to be parallel, when being situated in the same plane, they cannot meet, how far soever, either way, — both of them be produced 13. A plane figure is a plane terminated on all sides by lines, either straight or curved. If the lines... 
